02391naa a2200349 a 450000100080000000500110000800800410001902000220006002200140008210000240009624501710012026000090029149000310030052012350033165300320156665300190159865300200161765300200163765300320165765300270168965300170171665300170173365300260175065300200177670000160179670000210181270000200183370000240185370000150187770000170189277301320190910603992020-05-21       2019    bl uuuu     u00u1 u    #d  a978-9974-38-436-1  a1688-92661 aLÓPEZ VALIENTE, S.  aEfecto de la restricción proteica de las vacas Angus durante la gestación tardíabrendimiento reproductivo posterior y producción de leche.h[electronic resource]  c2019  a(INIA Serie Técnica; 252)  aABSTRACT The effect of level of CP fed during late gestation on reproductive performance and milk production was studied in multiparous cows. Sixty-eight pregnant Angus cows were used. At 121 d prepartum, cows were blocked by BW (409 ± 57 kg) and expected calving date, randomly assigned to a low-protein (LP = 6% CP) or high-protein diet (HP = 12% CP), and allocated to 12 pens per treatment. After parturition, all cows were managed in a single group until weaning. Body weight and BCS were determined at the start of the experiment, at calving, and at weaning. Progesterone was quantified weekly to indicate luteal activity and estimate interval to first estrus. Milk production was measured until weaning. The HP cows had greater BW gain during the prepartum period (P < 0.01) and tended to gain more BCS (P = 0.06) than LP cows. The prepartum diet did not affect gestation length (P = 0.44) or interval from calving to the onset of luteal activity (P = 0.35). Pregnancy rates, milk quality, and production were not influenced by dietary treatments. In conclusion, protein level prepartum in multiparous beef cows affected the BW change at calving, without consequences on reproductive performance and milk quality and yield.  aGESTACIÓN TARDÍA EN VACAS  aLATE GESTATION  aMILK PRODUCTION  aMULTIPAROUS COW  aPRODUCCIÓN DE LECHE VACUNA  aPROTEIN UNDERNUTRITION  aREPRODUCCION  aREPRODUCTION  aRESTRICCIÓN PROTEICA  aVACA MULTÍPARA1 aMARESCA, S.1 aRODRÍGUEZ, A.M.1 aPALLADINO, R.A.1 aLACAU-MENGIDO, I.M.1 aLONG, N.M.1 aQUINTANS, G.  tIn: QUINTANS, G.; IEWDIUKOW, M. (Ed.). Primer Seminario Técnico de Programación Fetal. Montevideo (UY): INIA, 2019. p. 23-30.